gruber



MECHANICAL 0R DROP HAMMER.

No. 588,422. Patented Aug. 1.7, 1897.-

/nesses Tm: cams pains cn., FnaTtLLITNn., wAsmNaTo, D. c.

3 Sheets-Sheet 2.

(No Model.)

C. GRBER. lvLLGHANICAL 0R DROP HAMMER.

7. m d r A d I.

am m Clflll'hesses TN: Nonms PETERS CQ. Puoi-@uvam wAsmNcToN, nv c (NoModel.) 3 Sheets-Sheet 3.

C.- GRUBER. MECHANICAL 0R DROP HAMMER. No. 588,422. Patented Aug. 17,1897.

' 112 elzor: Cl/tnes ses: U

www? ommw oRms PETERS co, #Nom-Limo., wAsHwaroN, u. c,

PATENT Fri-cn.

CARL GRBERQOF SCHVERTE, GERMANY.

MECHANICAL OR DROP HAMMER.

' SPECIFICATION forming part of Letters Patent No. 588,422, dated August1'7, 1897'.

` Application filed May l1, 1895. Serial No. 548,922. (No model.)Patented in England March 22, 1895, No. 6,014, and in i Germany DecemberZ8,1895,N0. 84,637.

To all whom it may concern/,-

Be it known that I, CARL GRBER, manufacturer, residing at No. 10Speckelbruch, Schwerte, Westphalia, Germany, have invented a Mechanicalor Drop Hammer, (for which I have obtained a patent in GreatBritain,'No. 6,014, dated March 22, 1895, and a patent in Germany, No.84,637, dated December 28, 1895,) of which the following. is aspecilication, reference being had therein to the accompanying drawings.

The present invention relates to a mechanical hammer or apparatusdesigned chieiiy for forging small work of varied section and certainarticles made in large quantities, such as screws, horseshoes, snaftlesor bits, stirrups, or the like.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is a side elevation, Fig. 2 a front elevation, and Fig. 3 aplan, ofthe mechanical hammer. Y Y

A framing or support a carries, by means of columns b, a frame c, thehorizontal parts of which carry adjustable sleeves e, in which thegravity-hammers ol are guided.

The machine comprises a greater or less number of hammers loperated byone and the same mechanism, according to the size of the work and thearticles to be produced. In the apparatus illustrated inthe annexeddrawings eight hammers are employed, the tops .or heads of which areprovided with removable dies g, to which correspond suitable removabledies g', which are let intoa common anvil and are carried by the framingor support a. I

The cavities in or formation of the dies clorrespond with the articlesto be produced and are so arranged' that the article is merely roughedout by the first hammer-that is to say, is forged ou t in mere outlines-and is then forged by the second hammer more nearly to itsfinished form, and so on till the article is finished. off by the lasthammer, and it may be also cut off thereby. A

Articles forged with these hammers and according to this method havemany advantages-for instance, they are finished or made without anyridges. This mode of working necessitates a mechanism for controllingthe hammer which can be easily and securely operated by the personholding or manipulating the article or work under treatment. is effectedaccording to the present invention in an extremely simple manner.

Mounted on the frame c and keyed fast on a shaft k is a wide drum c',(the width being proportionate according to the mechanical hammer,)which is kept continuously revolvingby means of fast and loose pulleys lor in small-sized plants by means of a crankhandle., y

Foreach hammer there is placed on the drum a strap, belt, or rope orequivalent h, one end of which is connected at m to the ham mer and theother end atn to a verticallyguided rod o, which is connected to a bentlever p, pivoted to the framing o.. This lever p is operated by means ofa rod q and a bent foot-lever or treadle r, whereby the rod is raised ordepressed. A spring s or similar device serves to keep the rod onormally in its highest position and consequently the belt h loose onthe drum. The drum rotates contin uously in the direction indicated bythe arrow in Fig. 1.

By treading upon r the corresponding rod ois drawn down and therespective belt or equivalent h, attached thereto, thereby drawn tight,so that it bears rmly upon the drum c', and thus raises the hammer.After the treading has taken place the spring s raises the rod o again,whereby the belt h is rendered loose, and the respective hammer d fallsdown.

That end of the rod q which is nearest to the bent lever p is provided,as is also the bent lever p, with a number of holes to enable thestrokeof the said lever to be varied 'with the same height of tread, so thatthe stroke of the rod o can be lengthened to a greater or less extentand the height of fall of the hammer be varied more or less, as desired.

There is advantageously provided on one side of the machine a .heavierhammer, such as t, which is employed for rough forging and for otherheavy work. This hammer tin the example illustra-ted is mounted by meansof a frame u on the frame c and is driven from a special counter-shaft owith fast and loose pulleys w.

This l IOO For this purpose a cam or tappet fr is Ixed on the shaft yz;and takes under an antifriction-roller fy, carried on the guide-rod ofthe hammerl t.

In order to increase the action of this hammer, there is provided at theend of the hammer guide-rod a springI z, which is placed under strainwhen the hammer is raised, and which, as soon as the roller y is clearof thc tappet, forces the hammer downward with greatly-increased force.

A locking-bolt K, which is held by a hook K2 while the hammer isworking, is adapted to be passed through a slot in the hammer guiderodand to take into a suitable recess K in the frame u for the purpose ofholding this hammer in its highest position when desired.

That I claim, and desire to secure by Letters Patent of the UnitedStates, is-

l. A mechanical hammer comprising a frame, a hammer-rod 1f, movablevertically in bearings in said frame and having a sleeve at its upperend, the double spring 2, having one of its arms connected to the frameabove the rod i, and its other arm extending loosely7 through the sleeveon said rod, the antifrietion-roller carried by the rod the shaft n, andthe tappeton said shaft for engaging the antifriction-roller,substantially as specified.

2. A mechanical hammer comprising a frame having the recess K', thehammer-rod 1f, movable vertically in bearings in said frame and having asleeve at its upper end and the hook K2, at an intermediate point of itslength, the double spring .2', having one of its arms connected to theframe above the rod l, and its other arm extending loosely through thesleeve on said rod, the antit'riction-roller carried by the rod i, theshaft i', the tappet on said shaft, for engaging theantiEriction-roller, and the hook K, loosely connected to the hammer-rod'15,' said hook being adapted to enter the recess K', in the frame andthereby hold the rod against vertical movement and being provided withla ring for engagement with the hook K2, when the hammer is in operation,substantially as specilied.

In a mechanical hammer, the combination of the frame, thecontinuously-rotating drum mounted on a shaft journaled in said frame, avertically-movable hammer-rod arranged in bearings in said frame, aflexible strap connected tothe upperend of the hammer-rod and extendingover the drum, the bell-crank, pedal-lever r, fulcrumed on the frame atthe base thereof, the bell-crank lever p, also fulcrumed on the frame,and having one of its arms connected with the ilexible strap, the linkconnecting the other arm ot the lever 2J, and one arm of the pedal-leverr, and the spring connected at one end to said link and at the other endto the frame, substantially as specified.

In witness whereof I have hereunto set my hand in presence of twoWitnesses.

CARL GRBER.

Witnesses:

F. II. STRAUss, A. STRAUss.

